TS19730 Single-Stage Low THD Buck-Boost PWM Control LED Driver

Transcription

1 SOT-26 Pin Definition: 1. V CC 2. GND 3. OUT 4. CL 5. COM 6. CS Description The is a high power factor, low THD and high accuracy constant current PWM controller. achieves high power factor and high efficiency by boundary current mode (BCM). The line and load regulation of LED current are within ±2.5%. also provides gate driving voltage clamping, V CC over-voltage protection, and system output open/short circuit protection to increase IC performance. Features Low THD <10% Constant Current Accuracy within ±2.5% High Power Factor >0.9 Low BOM Cost Boundary Conduction Mode Control Gate Output Voltage Clamp LED Open Protection LED Short protection Over Current Protection (OCP) Over Thermal Protection (OTP) Applications LED lighting Down light Tube lamp PAR lamp Bulb Ordering Information Part No. Package Packing CX6 RFG SOT-26 3kpcs / 7 Reel Note: G denotes for Halogen- and Antimony-free as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and <1000ppm antimony compounds (Note 1) Absolute Maximum Ratings Parameter Symbol Range Unit Power Supply Pin V CC 40 V CL Voltage to GND V CL -0.3 to 5.5 V OUT Voltage to GND V OUT -0.3 to 40 V CS Voltage to GND V CS -0.3 to 5.5 V COM Voltage to GND V COM -0.3 to 5.5 V Junction Temperature Range T J -40 to +150 C Storage Temperature Range T STG -65 to +150 C Lead Temperature (Soldering 10s) T LEAD 260 C Power T A =25 C P D 0.3 W ESD Rating (Human Body Mode) (Note2) HBM 2 kv ESD Rating (Machine Mode) (Note 2) MM 200 V (Note 3) Thermal Information Parameter Symbol Range Unit Thermal Resistance Junction to Ambient R θja 220 C/W Thermal Resistance Junction to Case R θjc C/W 1/7 Version: A15

2 Recommended Operating Conditions (Note 4) Parameter Symbol Conditions Unit Power Supply Pin V CC 33 V CL Voltage to GND V CL -0.3 to 5 V OUT Voltage to GND V OUT -0.3 to 19 V CS Voltage to GND V CS -0.3 to 5 V COM Voltage to GND V COM -0.3 to 5 V Operating Junction Temperature Range T J -40 to +125 C Operating Ambient Temperature Range T OPA -40 to +85 C Electrical Characteristics (V CC =18V, T C =25 C, unless otherwise specified.) Parameter Symbol Condition Min Typ Max Unit Supply Voltage Start-up Current V CC(ST) V CC = V UVLO(on) -1V μa Operating Current I OPA With 1nF load on out pin ma UVLO(off) V UVLO(off) V UVLO(on) V UVLO(on) V OVP Level on V CC Pin V OVP V Voltage Feedback Feedback Reference Voltage V FB V Transconductance g m μs Output Sink Current I O-SINK μa Output Source Current I O-SOURCE μa Current Sensing Open Loop Voltage V OLP CS Pin Open V Leading-Edge Blanking Time t LEB ns Delay to Output t DELAY ns Current Limit CL Limit Voltage V OCP V Switching Frequency Start Frequency f STR khz Gate Driver Output Rising Time t RISE Load Capacitance =1nF ns Falling Time t FALL Load Capacitance =1nF ns VGATE-Clamp V GATE V Thermal Section (Note 5,6) Thermal Shutdown C Thermal Shutdown Release C 2/7 Version: A15

3 Electrical Characteristics (Continue) Note: 1. Stresses listed as the above Absolute Maximum Ratings may cause permanent damage to the device. These are for stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may remain possibility to affect device reliability. 2. Devices are ESD sensitive. Handing precaution recommended. 3. Thermal Resistance is specified with the component mounted on a low effective thermal conductivity test board in free air at T A =25 C. 4. The device is not guaranteed to function outside its operating conditions. 5. Guaranteed by design. 6. Auto Recovery Type. Function Block VCC_OVP VREF UVLO/VBG VCC START VREF OUT Driver Q S SR Latch R OCP CL PRO (VCC_OVP, OTP) RST COM SAWTOOTH CS GND GM VREF Fig. 1 Pin Description Pin No. Name Function 1 V CC Power supply pin for all internal circuitry. 2 GND Ground return for all internal circuitry. 3 OUT Gate driver output. 4 CL Current limit. 5 COM Output pin of error amplifier. 6 CS Input current sense pin. 3/7 Version: A15

4 Typical Application Circuit Fuse AC Input MOV 90V~264V VCC CS GND COM OUT CL R CL R S Fig. 2 Application Information Start-up Current The typical start-up current is around 45μA. Very low start-up current allows the PWM controller to increase the value of start-up resistor and then reduce the power dissipation. UVLO(Under Voltage Lockout) A hysteresis UVLO comparator is implemented in. The turn-on and turn-off thresholds level are fixed at 17.5V and 8V respectively. This hysteresis shown in Fig.3 ensures that the start-up capacitor will be adequate to supply the chip during start-up. For quick start-up of the LED driver, the start-up resistor should be matched with the start-up capacitor. V CC V UVLO(on) 17.5V V UVLO(off) 8V Fig. 3 LEB(Leading-Edge Blanking) Each time the power MOSFET is switched on, a turn-on spike will inevitably occur at the sense resistor. To avoid fault trigger, a 400ns leading-edge blanking time is built in. Conventional RC filtering can therefore be omitted. During this blanking period, the current-limit comparator is disabled and cannot switch off the gate driver. OCP(Over Current Protection) The has built-in cycle by cycle over current protection function on CL pin. As the CL pin voltage is larger than V OCP (0.3V), the gate output will be turned off immediately to avoid the driver board to be burned out. 4/7 Version: A15

5 Application Information (Continue) OVP (Over Voltage Protection) on V CC To prevent the LED driver from being damaged, the has an implemented OVP function on V CC. When the V CC voltage is higher than the V OVP (31V), the output gate driver circuit will be shut down immediately to stop the switching of power MOSFET. The V CC pin OVP function is an auto recovery type protection. If the OVP condition happens, the pulses will be stopped until the V CC pin voltage is down to the UVLO off level. The is working in an auto-recovery mode as shown in Fig. 4. V CC V OVP V UVLO(on) V UVLO(off) OUT Non-Switching Fig. 4 Gate Clamp Driver is clamped to 12.5V by an internal clamping circuit to avoid the Gate of MOSFET to get damaged. 5/7 Version: A15

6 SOT-26 Mechanical Drawing Unit: Millimeters Marking Diagram SA = Device Code Y = Year Code M = Month Code for Halogen Free Product (O=Jan, P=Feb, Q=Mar, R=Apl, S=May, T=Jun, U=Jul, V=Aug, W=Sep, X=Oct, Y=Nov, Z=Dec) L = Lot Code 6/7 Version: A15

7 Notice Specifications of the products displayed herein are subject to change without notice. TSC or anyone on its behalf, assumes no responsibility or liability for any errors or inaccuracies. Information contained herein is intended to provide a product description only. No license, express or implied, to any intellectual property rights is granted by this document. Except as provided in TSC s terms and conditions of sale for such products, TSC assumes no liability whatsoever, and disclaims any express or implied warranty, relating to sale and/or use of TSC products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright, or other intellectual property right. The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications. Customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify TSC for any damages resulting from such improper use or sale. 7/7 Version: A15